Metallic nonskid tread



June 26, 1928. 1,674,712

I G. W.-BROOK$ METALLIC NONSKID TREAD Filed July 18, 1925 INVENTOR.

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BY gag/M4 ATTORNEY.

Patented June 26, 1928.

UNITED STATES GEORGE W'. BROOKS, OF TOPEKA, KANSAS.

METALLIC NONSKID TBLE A D.

Application filed July 18, 1925. Serial No. 44,527.

My invention relates to a metallic nonskid I tread, being made of brass, steel or other like metals.

The object of my invention is to provide a tread to be placed as a panel through door ways, or other points where travel is congested.

A further objectof my invention is to provide a tread having a series of-dove-tail grooves the edges of which will grip a flexible body impinged thereon.

A still further object of my invention is to provide a tread having a series of grooves in close proximity to each other and the side walls thereof converging upward, for a specific purpose hereinafter described.

A still further object of my invention is to provide a border around ornamental panels in concrete, having the nonskid feature in its exposed surface, and the portion extending downwardfunctioning as a bond between the adjacent panels.

Referring to the drawings, like characters will refer to like parts in the different views.

Figures 1, 2 and 3 are modified forms for borders dividing tile and concrete, the same being reversible, that is to say, the double dove-tail may be laced upward, and the single dove-tail;- paced downward in the concrete, the said dove-tailed members being connected by a webbing of varying forms, the said. webbing functioning as vertical anchoring means for the dove-tailed plate, and transverse bonding means for the concrete; that is to say, the contraction of the concrete will tend to separate along the lines of the webbing, the tension being in opposite directions on the extension members as at A and A- in Fig. 1, while in Fig. 2 the tension of separation will be imposed on the extensions at B and in the dove-tail at B. I now wish 'to call attention to the value of the small amount of wearing away of the plate which is means of the up-keep of the nonskid feature, that is to say the wear that would take place on the exposed face of the tongue 7 tends to sharpen the edges 6 of said tongue which would preserve the grip that it would not have otherwise, and by reason of the beveled sides, the edges are more easily sharpened, therefore the nonski d feature remains the same until the tongues have been worn to the level of the base of the grooves, as at F.

I am aware that nonskid plates have been made where curvatures have been employed and also grooves that have been filled with other materials, and grooves that are rectangular in the section, but such I do not claim as my invention, such modifications may be made as to the size of the dove-tail grooves and the slant of the side walls therea webbing having irregular sides connecting said treads and integral therewith, all as, and for the purpose described.

3. In a metallic nonskid tread, a metal structure having a dove-tailed grooved member on each side thereof of different widths, the said members being parallel and connected by a Webbing, extension members on the webbing as bonding means in the concrete, all as, and for the purpose described.

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